Mount St. Helens. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome.ount St. Helens. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome.
Definition of plantar. : of or relating to the sole of the foot plantar wart.
Plantar Fibromatosis. Plantar Fibromatosis is a foot condition where a small nodule grows in the arch of the foot on the plantar fascia. It is a benign growth (i.e. non-cancerous) which tends to be slow growing and usually less than an inch in size.t runs between the heel and the toes, helping to support the arches of the foot. In plantar fibromatosis, thickenings develop in the plantar fascia forming small nodules, usually in the central or medial portions of the plantar fascia.